/*
 * The MIT License
 *
 * Copyright (c) 2011 Takahiro Hashimoto
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package jp.a840.websocket.handler;

import java.nio.ByteBuffer;

import jp.a840.websocket.WebSocket;
import jp.a840.websocket.exception.WebSocketException;
import jp.a840.websocket.frame.Frame;
import jp.a840.websocket.frame.FrameParser;
import jp.a840.websocket.handshake.Handshake;

/**
 * The Class WebSocketStreamHandler.
 *
 * @author Takahiro Hashimoto
 */
public class WebSocketStreamHandler implements StreamHandler {

    /**
     * The handshake.
     */
    private final Handshake handshake;

    /**
     * The frame parser.
     */
    private final FrameParser frameParser;

    /**
     * Instantiates a new web socket stream handler.
     *
     * @param handshake   the handshake
     * @param frameParser the frame parser
     */
    public WebSocketStreamHandler(Handshake handshake, FrameParser frameParser) {
        this.handshake = handshake;
        this.frameParser = frameParser;
    }


    @Override
    public void nextUpstreamHandler(WebSocket ws, ByteBuffer buffer, Frame frame,
                                    StreamHandlerChain chain) throws WebSocketException {
        // TODO split buffer for WebSocket buffer size
        chain.nextUpstreamHandler(ws, frame.toByteBuffer(), null);
    }

    @Override
    public void nextDownstreamHandler(WebSocket ws, ByteBuffer buffer, Frame nullFrame,
                                      StreamHandlerChain chain) throws WebSocketException {
        while (buffer.hasRemaining()) {
            Frame frame = frameParser.parse(buffer);
            if (frame != null) {
                chain.nextDownstreamHandler(ws, buffer, frame);
            }
        }
    }

    @Override
    public void nextHandshakeUpstreamHandler(WebSocket ws, ByteBuffer buffer,
                                             StreamHandlerChain chain) throws WebSocketException {
        ByteBuffer request = handshake.createHandshakeRequest();
        chain.nextHandshakeUpstreamHandler(ws, request);
    }

    @Override
    public void nextHandshakeDownstreamHandler(WebSocket ws, ByteBuffer buffer,
                                               StreamHandlerChain chain) throws WebSocketException {
        if (handshake.handshakeResponse(buffer)) {
            chain.nextHandshakeDownstreamHandler(ws, buffer);
        }
    }

}
